Expandable acrylic resin bead, expanded acrylic resin bead, foamed molded article of expanded acrylic resin beads

Patent metadata

Field	Value
Publication number	US-9434830-B2
Application number	US-201514661614-A
Country	US
Kind code	B2
Filing date	Mar 18, 2015
Priority date	Mar 25, 2014
Publication date	Sep 6, 2016
Grant date	Sep 6, 2016

Abstract

Provided are: expandable acrylic resin bead and expanded acrylic resin bead, both having excellent moldability and capable of providing a foamed molded article that generates less soot during combustion and has a low decomposition gas generation speed; and a foamed molded article obtained through in-mold molding the expanded acrylic resin beads. The expandable acrylic resin bead is composed of an acrylic resin and a physical blowing agent impregnated therein. The acrylic resin contains a methacrylic ester component (A) and an acrylic ester component (B). The content of the component (A) is 85 to 99 mol % with respect to a total 100 mol % of the component (A) and the component (B). At least one of the component (A) and the component (B) contains a component having a polycyclic saturated hydrocarbon group. The glass transition temperature of the acrylic resin is 112 to 125° C.

First claim

What is claimed is:

1. An expandable acrylic resin bead comprising:
an acrylic resin having a glass transition temperature of 112 to 125° C.; and
a physical blowing agent;
wherein the acrylic resin comprises
a methacrylic ester component (A) and an acrylic ester component (B),
a content of the component (A) being 85 to 99 mol % with respect to a total 100 mol % of the component (A) and the component (B), and
at least one of the component (A) and the component (B) containing a component having a polycyclic saturated hydrocarbon group.

2. The expandable acrylic resin bead according to claim 1 , wherein the acrylic resin is a copolymer of the component (A) and the component (B).

3. The expandable acrylic resin bead according to claim 1 , wherein a content of the component having the polycyclic saturated hydrocarbon group in the acrylic resin is not more than 20 mol % with respect to the total 100 mol % of the component (A) and the component (B).

4. The expandable acrylic resin bead according to claim 1 , wherein the polycyclic saturated hydrocarbon group is dicyclopentanyl group, adamantyl group, norbornyl group, or isobornyl group.

5. The expandable acrylic resin bead according to claim 1 , wherein a weight-average molecular weight of the acrylic resin is 50,000 to 300,000.

6. An expanded acrylic resin bead obtained by expansion of the expandable acrylic resin bead according to claim 1 .

7. An expanded acrylic resin bead obtained by expansion of the expandable acrylic resin bead according to claim 2 .

8. An expanded acrylic resin bead obtained by expansion of the expandable acrylic resin bead according to claim 3 .

9. An expanded acrylic resin bead obtained by expansion of the expandable acrylic resin bead according to claim 4 .

10. An expanded acrylic resin bead obtained by expansion of the expandable acrylic resin bead according to claim 5 .

11. A foamed molded article obtained by in-mold molding the expanded acrylic resin beads according to claim 6 .

12. A foamed molded article obtained by in-mold molding the expanded acrylic resin beads according to claim 7 .

13. A foamed molded article obtained by in-mold molding the expanded acrylic resin beads according to claim 8 .

14. A foamed molded article obtained by in-mold molding the expanded acrylic resin beads according to claim 9 .

15. A foamed molded article obtained by in-mold molding the expanded acrylic resin beads according to claim 10 .

Assignees

• Jsp Corp

Inventors

• Goto Jumpei
• Kuwada Yota

Classifications

• C08J9/224

  Surface treatment · CPC title

• C08J2203/14

  Saturated hydrocarbons, e.g. butane; Unspecified hydrocarbons · CPC title

• C08J2207/00

  Foams characterised by their intended use · CPC title

• C08J9/18

  by impregnating polymer particles with the blowing agent · CPC title

• C08J2201/036

  Use of an organic, non-polymeric compound to impregnate, bind or coat a foam, e.g. fatty acid ester · CPC title